package dp;

import java.util.Arrays;

/**
 * @ Author     ：侯耀祖
 * @ Description：
 */
public class findTargetSumWays {
    public int findTargetSumWays(int[] nums, int target) {
        int sum = Arrays.stream(nums).sum();
        if(Math.abs(target) > sum){
            return 0;
        }
        if ((target+sum) % 2 == 1){
            return 0;
        }
        int bagSize = (target+sum) / 2;
        int[] dp = new int[bagSize + 1];
        dp[0] = 1;
        for (int i = 0; i < nums.length; i++) {
            for (int j = bagSize; j >= nums[i]; j--) {
                dp[j] += dp[j - nums[i]];
            }
        }
        return dp[bagSize];
    }
}
